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  • Title: Occurrence of autoantibodies against intrinsic factor, H,K-ATPase, and pepsinogen in atrophic gastritis and rheumatoid arthritis.
    Author: Mårdh S, Ma JY, Song YH, Aly A, Henriksson K.
    Journal: Scand J Gastroenterol; 1991 Oct; 26(10):1089-96. PubMed ID: 1658920.
    Abstract:
    The occurrence of autoantibodies against intrinsic factor, H,K-ATPase, and pepsinogen was analysed by means of enzyme-linked immunosorbent assay in three groups of sera. Group 1 comprised sera from 14 rheumatoid arthritis patients with normal acid secretion; group 2, sera from 18 rheumatoid arthritis patients with reduced acid secretion; and group 3, sera from 11 patients with pernicious anaemia or achylia. Groups 1 and 2 were rheumatoid factor-positive, and group 3 was negative. Intrinsic factor autoantibodies were low in groups 1 and 2. In group 3, 9 of the 11 sera (82%) scored positive. The highest titres of H,K-ATPase and pepsinogen autoantibodies were found in groups 2 and 3. Only one serum in group 1 scored positive against H,K-ATPase, and two against pepsinogen, whereas corresponding values were 11 (61%) and 7 (39%) in group 2, and 10 (91%) and 6 (55%) in group 3. Autoantibodies against H,K-ATPase from a pool of patient sera recognized both the alpha- and beta-subunits of the enzyme. The present results support the hypothesis of an autoimmune disease overlap between non-organ-specific rheumatoid arthritis and organ-specific pernicious anaemia.
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